Dental plate with rugæ on the lingual side.



G. A. CRITCHERSGN.

DENTAL PLATE WITH RUGE 0N THE LINGUAL SIDE.

APPLIoAT1oNrILEDNov-2z,191s.

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WIT/VESSES /IVVENTR ,4 TTUHNEVL.

THE MORRIS PETERS C0. PHOTO-LITHO.. WASHINGI'ON, D. I

93 Patented Feb. 243, 1915.

PATENT GEORGE A. CRITCHERSON, OF LOS ANGELES, CALIFORNIA, ASSIG-NOR TOTHE COLUMBUS DENTAL MANUFACTURING CO., OF COLUMBUS, OHIO, A CORPORATIONOF OHIO.

DENTAL PLATE WITH RUGE ON THE LINGUAL SIDE.

Specicaton of Letters Patent.

Patented Feb. 23, i915.

Application filed November 22, 1913. Serial No. 802,452.

geles and State of California, have invented certain new and usefulvImprovements in Dental Plates with Rugae on the Lingual Side, of whichthe following is a specification.

The figure in the drawing is a bottom plan view of a dental plateembodying my invention. s

In the manufacture in dental plates they have been molded with a smoothlingual side which results in imperfect articulation of speech and inimperfect rmanagement of food in mastication, because when `the lingualside of the plate is smooth the tongue has but little power to hold amorsel of food upon it.

The object of my invention is to produce a duplication of the naturalrugae of a human mouth in the lingual side of denture plates by means ofa suitable mold held in the plaster when the plate is flasked.

A suitable rugae mold, such for instance as that shown in my divisionalapplication filed May lst, 1914, Serial No. 835,669, is placed on thedenture plate before the plate is flashed, such mold being formed with aCopies of this patent may be obtained for series of undulations, inimitation of a natural rugae, which lwill produce, in the lingual sideof the plate a rugae without discoloration or injury to the material ofwhich the plate is composed, and when the mold is removed thesurface ofthe vulcanite will be left clean and smooth and will require but littlepolishing.

The purpose of my invention is to form a rugae l on the lingual side ofthe plate so asl to enable persons using dental plates to pronounce allwords with freedom and distinctness, especially those words requiringthe tongue to beplaced against the roof of the mouth, and which can onlybe pronounced clearly through the cooperation of the ruga@ and thetongue, besides which the rugae is of material assistance to the tonguein the management of food in mastication, which, of course, is ofmaterial importance in maintaining ones health.

I claim: A dental plate with rugae molded on the lingual side thereof.

In testimony whereof I afliX my signature in presence of two witnesses.

GEORGE A. CRITCI-IERSON.

Titnessesz C. W. ROHRER, FLORENCE E. LEA.

ve cents each, by addressing the Commissioner of Patents,

Washington, D. C.

